Fishing tool



C. GAUTHIER Aug. 20, 1940.

FISHING TOOL Filed Sept. 22, 1939 orculafzng f/uid.

lNYE/VTOE Mfw Patented Aug. 20, 1940 UNITED STATES ATENT;,emce- 2,211,973 FISHING TOOL Crosby Gauthier, South Pasadena, Calif. Application September 22,1939, Serial No. 296,010 4 Claims. (01. 294 96) t This invention relates to oil-well fishing tools and has to do specifically with an improved pintapwhich is a device designed for unscrewing and removing sections of drill pipe from abore hole when the bit or other tool attached to the lower end thereof is stuck and cannot be dislodgedmaking it necessary to remove the-attacheddrill pipe from the stuck bit or other tool, and remove it from the hole, in order to gain access to the stuck tool.

My object is to provide a pin-tap of more simple design than has heretofore been available and one which will operate more satisfactorily and reliably than any of its predecessors.

In the drawing which accompanies this specification:

Fig. 1 is an elevational View of my new pin-tap;

Fig. 2 is a vertical sectional view; and

Fig. 3 is a cross-sectional view along the line 3-3 of Figs. 1 and 2.

It is to be understood that each section of drill string which is to be unscrewed and removed from the hole has a box in its upper end and that the pin-tap is intended to be screwed into the box and then expanded so as to increase its frictional grip upon the box and thereafter rotated to the leftwhereupon the drill string will part at one of its joints at a point below the pin-tap. And it will be further understood that the tool-string is provided with left-hand threaded tool joints which will not uncouple when the pin-tap is being rotated in a direction to unscrew the drill string.

In the drawing, reference numeral I identifies a sub at the lower end of the tool string-said sub being of reduced diameter at 2 to receive a sleeve 3 having a tapered external thread 4 designed to engage a box at the upper end of the drill string. Sleeve 3 is keyed or splined to the sub I so as to be rotatabletherewith but slidable axially with respect thereto-three splines being shown in Fig. 3 and identified by numeral 5. Sleeve 3 is slotted through as at 6 to form three or more threaded segments whereby the threaded A jar should be inserted in the tool string above the pin-'tap'but' since such jars are conventional equipment and well known, I do not con sider it necessary to include the jar in'the drawing.

The operation of my new pin-tap is very simple and self-evident. After the pin-tap has been screwed into the box, the tool string is lifted, which causes an upward movement of the mandrel l relatively to the sleeve. Due to the taper of the mandrel, the threaded portion of the sleeve is expanded whereby to tightly grip the box. Then the tool string is rotated in a direction to unscrew the drill string-a joint of which will yield before the pin-tap thread will slip in the box. Repeated operations will remove the whole drill string.

The function of the jar is to enable an upwardly directed blow to be applied to the mandrel for tightening the pin-tap in the'box, and to enable a downward blow to be applied to the mandrel for releasing the pin-tap at the derric floor. v

What is claimed is:

1. A pin-tap comprising a sleeve designed to be-attached to the lower end of a tool string so as to be rotatable withsaid tool string and movable vertically relatively thereto, said sleeve hav-' for eifecting rotation of said sleeve by the tool string, said means being operative to positively rotate the sleeve independently of frictional driving engagement between said tapered member and said sleeve.

2. A pin-tap comprising an annular sleeve member having an externally threaded portion designed to thread into and thus engage the internal thread of a box and split to permitexpansion radially, said sleeve memberbeing splined to the lower end of a tool string, so as to be rotatable by and with the tool string and vertically movable relatively thereto, and amandrel co-axial with said sleeve member, said mandrel being attached to the lower end of thetool string and movable vertically with the tool string and relatively to said sleeve member, said mandrel.

having a tapered portion in engagement with the split portion of said sleeve member and operative to effect a radial expansion of said split portion in response to an upward movement of said mandrel and tool string relatively to said sleeve memher.

3. A pin-tap comprising externally threaded means designed to thread into and thus engage the internal thread of a box and consisting of a plurality of segments disposed about a common axis, each of which segments is capable of limited movement toward and away from said axis, said externally threaded means being designed to be connected to the lower end of a tool string and to be positively rotatable by and with said tool string and movable vertically, to a limited extent, relatively to said tool string, and actuating means carried by said tool string and movable vertically therewith, said actuating means being operative to effect a movement of said segments away from said axis in response to an upward movement of said: tool string when said externally threaded means is restrained against upward movement.

4. A pin-tap comprising externally threaded means designed to thread into and thus engage the internal thread of a box and consisting of a plurality of segments disposed about a common axis, each of which segments is capable of limited movement toward and away from said axis, said externally threaded means being designed to be connected to the lower end of a tool string and to be rotatable by and with said tool string and movable vertically, to a limited extent, relatively to said tool string, and a mandrel co-axial with said externally threaded means, said mandrel being connected to said tool string and movable vertically therewith, said mandrel having a tapered portion in operating relation to said segments whereby to cause a movement of said segments away from said axis in response to an upward movement of said tool string when said externally threaded means is restrained against upward movement.

CROSBY GAUTI-HER. 

